There are excited reports of snow across Cornwall this morning and the weathermen say the icy Scandinavian blast is slowly moving towards Devon.

Cornwall woke up to the white stuff settling in Truro, Hayle, Goonhavern and Falmouth. And there was one early report of snow in Devon (but so far it's just three flakes).

A severe weather warning has been issued from 5am on Tuesday until 10am on Wednesday, with snow, sleet and hail forecast for the county. Some transport disruption is possible, with longer journey times and delays to public transport.

Icy patches are likely to develop on some untreated roads, pavements and cycle paths, leading to an increased risk of injuries and accidents.

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Sub-zero temperatures will grip most of the country overnight on Tuesday under clear skies and it will seem like -19C in a vicious wind chill in Scotland.

Forecaster Hannah Findley, of The Weather Channel, said: “The lowest we’re currently forecasting for Tuesday night is -12C in the Cairngorms, but this will feel like -19C in the wind chill.

“It will be a mostly clear night in this area, so temperatures may drop lower. There will also be 20 to 40cm of lying snow in the Cairngorms.“

(Image: The Weather Channel)

Despite plunging temperatures, there is still some way to go before the chill rivals the coldest-ever recorded on February 7 when the mercury dropped to -21.7C in Aviemore in the Scottish Highlands in 1895.

There will be a slightly milder window on Thursday, but it will be barely noticeable, and the chill will return for the weekend.

Heavy snow showers will move across the north-west on Friday before more unsettled conditions take charge on Saturday. Bands of snow and sleet will move south-eastwards during the weekend with colder, showery conditions following.